You can simply use toggle class and apply css for color change and up and down both should not be clicked together. ... <看更多>

The class "fa fa-thumbs-o-up" and "fa fa-thumbs-up" are combination of classes separated by space. That's why we get an error when we try to ... ... <看更多>

Challenge Waypoint: Add Font Awesome Icons to all of our Buttons has an issue. User Agent is: Mozilla/5.0 (Windows NT 10.0; ... ... <看更多>